EP 0353779 A2 19900207 - Preamble detection circuit for digital communications system.
Title (en)
Preamble detection circuit for digital communications system.
Title (de)
Schaltung zur Feststellung der Präambel für ein digitales Übertragungssystem.
Title (fr)
Circuit de détection de préambule pour un système de communication numérique.
Publication
Application
Priority
JP 19591188 A 19880805
Abstract (en)
In a burst mode digital communication system, a preamble containing a predetermined bit pattern and a digital signal are modulated upon orthogonal carriers and transmitted in a series of burst signals. At a distant end of the system, the preamble and the digital signal are noncoherently detected with locally generated orthogonal carriers having the same frequency as the transmitted orthogonal carriers to produce in-phase and quadrature signals. First and second correlators are provided to perform a correlation calculation between a locally generated bit pattern and the in-phase signal and to perform a correlation calculation between the local bit pattern and the quadrature signal. A phase error of the local carriers with respect to the transmitted carriers is detected from the outputs of the first and second correlators. A clock phase error of a locally generated clock pulse with respect to symbols contained in the transmitted burst signals is detected from one of the outputs of the correlators. Power level detector is connected to the outputs of the correlators for detecting a power level of the received burst signals. The carrier and clock phase error detection as well as the power level detection are performed in a parallel fashion, allowing a reduction of the amount of information contained in the preamble.
IPC 1-7
IPC 8 full level
H04L 7/00 (2006.01); H04L 7/04 (2006.01); H04L 27/22 (2006.01); H04L 27/227 (2006.01); H04L 27/233 (2006.01); H04L 27/38 (2006.01); H04L 7/033 (2006.01); H04L 27/00 (2006.01)
CPC (source: EP US)
H04L 7/046 (2013.01 - EP US); H04L 27/2275 (2013.01 - EP US); H04L 27/2332 (2013.01 - EP US); H04L 7/033 (2013.01 - EP US); H04L 2027/003 (2013.01 - EP US); H04L 2027/0057 (2013.01 - EP US); H04L 2027/0095 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0353779 A2 19900207; EP 0353779 A3 19911211; EP 0353779 B1 19951102; AU 3939389 A 19900208; AU 624404 B2 19920611; DE 68924677 D1 19951207; DE 68924677 T2 19960411; JP H0244947 A 19900214; JP H0716206 B2 19950222; US 5012491 A 19910430
DOCDB simple family (application)
EP 89114484 A 19890804; AU 3939389 A 19890807; DE 68924677 T 19890804; JP 19591188 A 19880805; US 39004089 A 19890807